An Etymological Dictionary of Astronomy and Astrophysics

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epicyclic frequency
  بسامد ِ اپی-چرخه‌ای  
basâmad-e apicarxe-yi
Fr.: fréquence épicyclique  

In the → epicyclic theory of Galactic rotation, the frequency at which a star in the → Galactic disk describes an ellipse around its mean circular orbit. The epicyclic frequency relates to the → Oort’s constants. In the solar neighborhood the epicyclic frequency is about 32 km s-1 kpc-1.

See also: → epicyclic; → frequency.